Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfb48e59256c47a…

MALICIOUS

PDF

93.4 KB Created: 2021-07-15 13:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c68c812ae16c5b54568351146552a8f0 SHA-1: 0bdc794613283a8a23e579266e9e4c5074545da8 SHA-256: acfb48e59256c47a067a777d1f19ed4e0f2a7239fd0efd9407260ff474b9ef7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The PDF itself contains no readable content, only obfuscated data, further supporting its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rheumatology.institute/upload/content/file/76657407882.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/90up6gos3gll4pnq8uuhd266ph/rofesesutaputekijifipiga.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d3d6638c---91967081324.pdf
    • https://binhvi.com/upload/files/pazupajazod.pdf
    • http://bygreenpure.com/userfiles/file/ruwojerejedixa.pdf
    • https://cncunse.com/d/files/dabifavadubodegosile.pdf
    • https://seeandhearbetter.ie/img/shop//contents/mokozanuneta.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/37547303124.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a290da4a85e---54287323053.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67ccf0b81c---96675173735.pdf
    • http://jfhcoaching.com/userfiles/files/risetofum.pdf
    • http://kyanite.tv/userfiles/file/fuboladopupiwademamubaja.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbebe11dca0---15777881732.pdf
    • https://flardochform.se/userfiles/file/zilugezik.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b890f54ca97---jisupoxigoz.pdf
    • http://zovsh.com/Uploadfiles/files/75481176267.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b2tjb67rjhulfqduiu749nnabr/22934501119.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e86704125e2---91766327603.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d269e480255---2945717042.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cc3ca267e84019a158e2da1b2aa80ac/lowura.pdf
    • http://adance0112.com/upfile/editor/file/76158715661.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/219107c7584206ed84cb33d1e1dc7b8f/15344036079.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/cb0ifahcuhvipc6a1af7t3s0jl/93758482071.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/fcbc696d18b3a58f649dcb6f9c7c7e2b/35953114907.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/afc911a20f4cdab3e47f18f4db1c3d10/76698820281.pdf
    • http://sbox-technology.com/upload/datoteke/59118815077.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7865e4351---41754648765.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tripping+pipe+on+a+drilling+rig
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 16792 bytes
font_01_sfnt_off000124d2.bin
c32f728bc5963a204675bf0c92618bf833d7e1bdc7dd34f98372d81307bb3d2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 16960 bytes
font_02_sfnt_off0001510c.bin
a9022110ed14814d28126d5f25feb0f2d6e34f18d7ae24437781fb3a121d8479
pdf-font-stream PDF embedded font (sfnt) at offset 0x1510C 10264 bytes